In a large skillet over medium-high heat, add the olive oil and brown the ground beef until no pink remains, breaking it into small crumbles with a wooden spoon.
Transfer the cooked beef to a 6-quart slow cooker, draining any excess liquid from the pan before adding.
Add the kidney beans, diced tomatoes, tomato sauce, yellow onion, and green bell pepper to the slow cooker pot.
Pour in the beef bone broth and sprinkle the chili powder, ground cumin, garlic powder, sea salt, and black pepper over the ingredients.
Stir the mixture thoroughly to ensure the spices and vegetables are evenly distributed.
Cover the slow cooker with its lid and cook on the low setting for 6 to 8 hours, or on the high setting for 3 to 4 hours, to allow the flavors to develop.
Stir the chili once more before serving hot in deep bowls.